The best part of PA food IMO — particularly SE PA — is the snack/chip aisle in grocery stores. Whereas the aisle is almost entirely Lays brands in other regions, PA has a flourishing small-snack ecosystem and only a few have escaped to other regions or been eaten up by FritoLayCo (like Herrs, Snyders, and Utz).
Best parts include potato chips cooked in lard (many brands including Goods and Gibbles and Martins and more) and really good pretzels (Hammonds).